bihl+Wiedemann AS-i/Modbus Gateway, User Manual, Page: 31 / 60

AS-i/Modbus Gateway Operating the AS-i/Modbus Gateway
Subject to reasonable modifications due to technical advances Copyright Bihl+Wiedemann, Printed in Germany
Bihl+Wiedemann GmbH · D-68199 Mannheim · Tel. +49-621-339960 · Fax +49-621-3392239 · Internet http://www.bihl-wiedemann.de
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6 Operating the AS-i/Modbus Gateway
6.1 Peculiarities with Double Masters
In configuration mode all detected AS-i slaves are displayed at first before the dis-
play switches to the other AS-i circuit.
The operation of the push buttons is always related to the currently displayed AS-i cir-
cuit (LED AS-i 1/AS-i 2). After a push button was pressed the display stays with the
respective AS-i circuit until the operation is finished or the operator has not interfered
for 10 seconds.
6.2 Master Start-Up
After powering on, all segments of the figure display and all LEDs light up for approx-
imately one second (self-test). Afterwards, the LEDs display the condition of their re-
spective flags. The LCD displays the condition of the master:
40 Off-line Phase
The AS-i master initializes - there is no data communication on the AS-i.
41 Detection Phase
Start of the start-up phase, where the system looks for slaves located on
the AS-i. The master remains in the detection phase until it finds at least
one slave.
42 Activation Phase
Condition at the end of the start-up operation where the parameters are
transmitted to all connected and recognized slaves. This enables access
to the AS-i slaves’ data connections.
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Start of Normal Operation
In normal operation the AS-i master can exchange data with all active
slaves. It transmits management messages and looks for and activates
newly connected slaves. During normal operation, the system keeps the
maximum cycle time of 5 milliseconds.
In protected mode the displays of the double Masters are switched
over from AS-i circuit 1 to AS-i circuit 2 in a measure of 2 seconds.
If the AS-i circuit is insufficiently powered (“U ASI” does not
light up) or there is no communication relationship between
the Modbus master and the AS-i/Modbus gateway, the
master remains in the off-line phase.
1. Activation phase and the start of normal operation maybe so short that the numbers can not be seen in the display.